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how do you filter pandas dataframes by multiple columns
To filter a dataframe (df) by a single column, if we consider data with male and females we might:
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Java Synchronized Block for .class
What does this java code mean? Will it gain lock on all objects of MyClass ?
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How to move certain commits to be based on another branch in git?
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How to template If-Else structures in data-bound views?
I constantly find myself using this idiom in KO-based HTML templates:
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Is there any way to view the currently mapped keys in Vim?
Basically, I'd like to view all of the keys maps made in the current buffer by all of plugins, vimrc, etc, in the current buffer. Is there anyway to do this?
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CocoaPods and GitHub forks
This is my first time forking a GitHub project, and I'm not too competent with CocoaPods either, so please bear with me.
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How do I view all commits for a specific day?
I've already looked at the relevant docs from git-scm.com and gitref.org , but I can't seem to figure this out.
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XML Validation with XSD in Visual Studio IDE
I know I have done this before, but it isn't working today, nor can I find anywhere that explains how to do it. It could be my lack of sleep, but I suspect gremlins.
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Is an index needed for a primary key in SQLite?
When an integer column is marked as a primary key in an SQLite table, should an index be explicitly created for it as well? SQLite does not appear to automatically create an index for a primary key column, but perhaps it indexes it anyway, given its purpose? (I will be searching on that column all t...
How to undo the effect of “set -e” which makes bash exit immediately if any command fails?
After entering set -e in an interactive bash shell, bash will exit immediately if any command exits with non-zero. How can I undo this effect?
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